United manager Jose Mourinho told the club’s official website: “Diogo is an extremely talented young defender with all the qualities to quickly become a great player for this club.

“He has all the attributes that a full-back needs: physicality, tactical intelligence and technical quality, combined with a Porto Academy mentality which prepares players for the maturity they need at the professional level.

Manchester United signing Diogo Dalot (Image: manutd.comn)

“In his age group, he is the best full-back in Europe and we all believe he has a bright future ahead of him at Manchester United.”